<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <link rel="stylesheet" href="./bootstrap-3.4.1-dist/css/bootstrap.min.css">
</head>
<style>

    .container{
        height: 100px;
        background-color: pink;
    }
    div{
       
        height: 50px;
        background-color: gray;
    }
</style>

<body>
    <div class="container">
        <div class="col-lg-3 col-md-6 col-sm-12">1</div>
        <div class="col-lg-3 col-md-6 col-sm-12">1</div>
        <div class="col-lg-3 col-md-6 col-sm-12">1</div>
        <div class="col-lg-3 col-md-6 col-sm-12">1</div>

    </div>
</body>

</html>